Which of these contribute to a healthy family life? Select the two correct answers.
A. Random punishments for all family members
B. Occasional physical abuse by siblings
C. Daily meals that are eaten together
D. Age-appropriate tasks for all family members

Investigator a has biological specimens that are coded and linked to identifiers of the source individuals. investigator a provides the specimens to investigator b but does not provide the individual identifiers. investigator b agrees not to re-identify the source individuals. is investigator b's research using the biospecimens human subjects research according to the definition of human subjects research in the federal regulations?